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Finding the Fourth Proportional to 68,776.43, 103,144.08 and 20,743.03

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Solution

The fourth proportional to 68,776.43, 103,144.08 and 20,743.03 is: 31,108.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,776.43 : 103,144.08 = 20,743.03 : x
  2. Step 2: Convert to fraction form
    68,776.43/103,144.08 = 20,743.03/x
  3. Step 3: Cross multiply
    68,776.43x = 103,144.08 × 20,743.03
  4. Step 4: Simplify right side
    68,776.43x = 2,139,520,745.76
  5. Step 5: Solve for x
    x = 2,139,520,745.76/68,776.43
  6. Step 6: Final answer
    x = 31,108.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.